Fuel composition supply means for spark ignition engines
AssigneesExxonMobil Research and Engineering Company, Toyota Jidosha Kabushiki Kaisha
InventorsWalter Weissman, Randall D. Partridge, Bhupender S. Minhas, Guido Sartori, Takanori Ueda, Yoshihiro Iwashita, Kazuhiro Akihama, Satoshi Yamazaki
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Abstract
A fuel system for on-board vehicle fuel separation to supply engine fuel compositions formulated as a function of driving cycle conditions. The invention results in improvements in one or more of feed efficiency and combustion emissions.
Claims11
A fuel system for supplying a plurality of fuels boiling in the gasoline range for use in a spark ignition, internal combustion engine comprising a fuel supply, a membrane in operable communication with the fuel supply for separating said fuel supply into at least a first fuel, said first fuel having a RON greater than about 98 and an aromatics content greater than about 45 vol % and a second fuel.
A method for operating a vehicle having a spark ignition engine to increase the efficiency and reduce the emissions of the engine under conditions of use comprising:
- supplying a fuel to a fuel separation means;
- separating said fuel into a least first and second fuel;
- supplying at least a first fuel to the engine at about high engine load conditions;
- and
- supplying at least a second fuel to the engine at about low engine load conditions,
- the first fuel having a RON greater than 98;
- the second fuel having a RON less than about one RON below the supply fuel, and
- whereby engine efficiency is increased and emissions are reduced.
Dependencies are inferred from the claim text.